drivers/media/dvb-frontends/isl6423.c

   1 /*
   2         Intersil ISL6423 SEC and LNB Power supply controller
   3
   4         Copyright (C) Manu Abraham <abraham.manu@gmail.com>
   5
   6         This program is free software; you can redistribute it and/or modify
   7         it under the terms of the GNU General Public License as published by
   8         the Free Software Foundation; either version 2 of the License, or
   9         (at your option) any later version.
  10
  11         This program is distributed in the hope that it will be useful,
  12         but WITHOUT ANY WARRANTY; without even the implied warranty of
  13         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14         GNU General Public License for more details.
  15
  16         You should have received a copy of the GNU General Public License
  17         along with this program; if not, write to the Free Software
  18         Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include <linux/delay.h>
  22 #include <linux/errno.h>
  23 #include <linux/init.h>
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/string.h>
  27 #include <linux/slab.h>
  28
  29 #include <media/dvb_frontend.h>
  30 #include "isl6423.h"
  31
  32 static unsigned int verbose;
  33 module_param(verbose, int, 0644);
  34 MODULE_PARM_DESC(verbose, "Set Verbosity level");
  35
  36 #define FE_ERROR                                0
  37 #define FE_NOTICE                               1
  38 #define FE_INFO                                 2
  39 #define FE_DEBUG                                3
  40 #define FE_DEBUGREG                             4
  41
  42 #define dprintk(__y, __z, format, arg...) do {                                          \
  43         if (__z) {                                                                      \
  44                 if      ((verbose > FE_ERROR) && (verbose > __y))                       \
  45                         printk(KERN_ERR "%s: " format "\n", __func__ , ##arg);          \
  46                 else if ((verbose > FE_NOTICE) && (verbose > __y))                      \
  47                         printk(KERN_NOTICE "%s: " format "\n", __func__ , ##arg);       \
  48                 else if ((verbose > FE_INFO) && (verbose > __y))                        \
  49                         printk(KERN_INFO "%s: " format "\n", __func__ , ##arg);         \
  50                 else if ((verbose > FE_DEBUG) && (verbose > __y))                       \
  51                         printk(KERN_DEBUG "%s: " format "\n", __func__ , ##arg);        \
  52         } else {                                                                        \
  53                 if (verbose > __y)                                                      \
  54                         printk(format, ##arg);                                          \
  55         }                                                                               \
  56 } while (0)
  57
  58 struct isl6423_dev {
  59         const struct isl6423_config     *config;
  60         struct i2c_adapter              *i2c;
  61
  62         u8 reg_3;
  63         u8 reg_4;
  64
  65         unsigned int verbose;
  66 };
  67
  68 static int isl6423_write(struct isl6423_dev *isl6423, u8 reg)
  69 {
  70         struct i2c_adapter *i2c = isl6423->i2c;
  71         u8 addr                 = isl6423->config->addr;
  72         int err = 0;
  73
  74         struct i2c_msg msg = { .addr = addr, .flags = 0, .buf = &reg, .len = 1 };
  75
  76         dprintk(FE_DEBUG, 1, "write reg %02X", reg);
  77         err = i2c_transfer(i2c, &msg, 1);
  78         if (err < 0)
  79                 goto exit;
  80         return 0;
  81
  82 exit:
  83         dprintk(FE_ERROR, 1, "I/O error <%d>", err);
  84         return err;
  85 }
  86
  87 static int isl6423_set_modulation(struct dvb_frontend *fe)
  88 {
  89         struct isl6423_dev *isl6423             = (struct isl6423_dev *) fe->sec_priv;
  90         const struct isl6423_config *config     = isl6423->config;
  91         int err = 0;
  92         u8 reg_2 = 0;
  93
  94         reg_2 = 0x01 << 5;
  95
  96         if (config->mod_extern)
  97                 reg_2 |= (1 << 3);
  98         else
  99                 reg_2 |= (1 << 4);
 100
 101         err = isl6423_write(isl6423, reg_2);
 102         if (err < 0)
 103                 goto exit;
 104         return 0;
 105
 106 exit:
 107         dprintk(FE_ERROR, 1, "I/O error <%d>", err);
 108         return err;
 109 }
 110
 111 static int isl6423_voltage_boost(struct dvb_frontend *fe, long arg)
 112 {
 113         struct isl6423_dev *isl6423 = (struct isl6423_dev *) fe->sec_priv;
 114         u8 reg_3 = isl6423->reg_3;
 115         u8 reg_4 = isl6423->reg_4;
 116         int err = 0;
 117
 118         if (arg) {
 119                 /* EN = 1, VSPEN = 1, VBOT = 1 */
 120                 reg_4 |= (1 << 4);
 121                 reg_4 |= 0x1;
 122                 reg_3 |= (1 << 3);
 123         } else {
 124                 /* EN = 1, VSPEN = 1, VBOT = 0 */
 125                 reg_4 |= (1 << 4);
 126                 reg_4 &= ~0x1;
 127                 reg_3 |= (1 << 3);
 128         }
 129         err = isl6423_write(isl6423, reg_3);
 130         if (err < 0)
 131                 goto exit;
 132
 133         err = isl6423_write(isl6423, reg_4);
 134         if (err < 0)
 135                 goto exit;
 136
 137         isl6423->reg_3 = reg_3;
 138         isl6423->reg_4 = reg_4;
 139
 140         return 0;
 141 exit:
 142         dprintk(FE_ERROR, 1, "I/O error <%d>", err);
 143         return err;
 144 }
 145
 146
 147 static int isl6423_set_voltage(struct dvb_frontend *fe,
 148                                enum fe_sec_voltage voltage)
 149 {
 150         struct isl6423_dev *isl6423 = (struct isl6423_dev *) fe->sec_priv;
 151         u8 reg_3 = isl6423->reg_3;
 152         u8 reg_4 = isl6423->reg_4;
 153         int err = 0;
 154
 155         switch (voltage) {
 156         case SEC_VOLTAGE_OFF:
 157                 /* EN = 0 */
 158                 reg_4 &= ~(1 << 4);
 159                 break;
 160
 161         case SEC_VOLTAGE_13:
 162                 /* EN = 1, VSPEN = 1, VTOP = 0, VBOT = 0 */
 163                 reg_4 |= (1 << 4);
 164                 reg_4 &= ~0x3;
 165                 reg_3 |= (1 << 3);
 166                 break;
 167
 168         case SEC_VOLTAGE_18:
 169                 /* EN = 1, VSPEN = 1, VTOP = 1, VBOT = 0 */
 170                 reg_4 |= (1 << 4);
 171                 reg_4 |=  0x2;
 172                 reg_4 &= ~0x1;
 173                 reg_3 |= (1 << 3);
 174                 break;
 175
 176         default:
 177                 break;
 178         }
 179         err = isl6423_write(isl6423, reg_3);
 180         if (err < 0)
 181                 goto exit;
 182
 183         err = isl6423_write(isl6423, reg_4);
 184         if (err < 0)
 185                 goto exit;
 186
 187         isl6423->reg_3 = reg_3;
 188         isl6423->reg_4 = reg_4;
 189
 190         return 0;
 191 exit:
 192         dprintk(FE_ERROR, 1, "I/O error <%d>", err);
 193         return err;
 194 }
 195
 196 static int isl6423_set_current(struct dvb_frontend *fe)
 197 {
 198         struct isl6423_dev *isl6423             = (struct isl6423_dev *) fe->sec_priv;
 199         u8 reg_3 = isl6423->reg_3;
 200         const struct isl6423_config *config     = isl6423->config;
 201         int err = 0;
 202
 203         switch (config->current_max) {
 204         case SEC_CURRENT_275m:
 205                 /* 275mA */
 206                 /* ISELH = 0, ISELL = 0 */
 207                 reg_3 &= ~0x3;
 208                 break;
 209
 210         case SEC_CURRENT_515m:
 211                 /* 515mA */
 212                 /* ISELH = 0, ISELL = 1 */
 213                 reg_3 &= ~0x2;
 214                 reg_3 |=  0x1;
 215                 break;
 216
 217         case SEC_CURRENT_635m:
 218                 /* 635mA */
 219                 /* ISELH = 1, ISELL = 0 */
 220                 reg_3 &= ~0x1;
 221                 reg_3 |=  0x2;
 222                 break;
 223
 224         case SEC_CURRENT_800m:
 225                 /* 800mA */
 226                 /* ISELH = 1, ISELL = 1 */
 227                 reg_3 |= 0x3;
 228                 break;
 229         }
 230
 231         err = isl6423_write(isl6423, reg_3);
 232         if (err < 0)
 233                 goto exit;
 234
 235         switch (config->curlim) {
 236         case SEC_CURRENT_LIM_ON:
 237                 /* DCL = 0 */
 238                 reg_3 &= ~0x10;
 239                 break;
 240
 241         case SEC_CURRENT_LIM_OFF:
 242                 /* DCL = 1 */
 243                 reg_3 |= 0x10;
 244                 break;
 245         }
 246
 247         err = isl6423_write(isl6423, reg_3);
 248         if (err < 0)
 249                 goto exit;
 250
 251         isl6423->reg_3 = reg_3;
 252
 253         return 0;
 254 exit:
 255         dprintk(FE_ERROR, 1, "I/O error <%d>", err);
 256         return err;
 257 }
 258
 259 static void isl6423_release(struct dvb_frontend *fe)
 260 {
 261         isl6423_set_voltage(fe, SEC_VOLTAGE_OFF);
 262
 263         kfree(fe->sec_priv);
 264         fe->sec_priv = NULL;
 265 }
 266
 267 struct dvb_frontend *isl6423_attach(struct dvb_frontend *fe,
 268                                     struct i2c_adapter *i2c,
 269                                     const struct isl6423_config *config)
 270 {
 271         struct isl6423_dev *isl6423;
 272
 273         isl6423 = kzalloc(sizeof(struct isl6423_dev), GFP_KERNEL);
 274         if (!isl6423)
 275                 return NULL;
 276
 277         isl6423->config = config;
 278         isl6423->i2c    = i2c;
 279         fe->sec_priv    = isl6423;
 280
 281         /* SR3H = 0, SR3M = 1, SR3L = 0 */
 282         isl6423->reg_3 = 0x02 << 5;
 283         /* SR4H = 0, SR4M = 1, SR4L = 1 */
 284         isl6423->reg_4 = 0x03 << 5;
 285
 286         if (isl6423_set_current(fe))
 287                 goto exit;
 288
 289         if (isl6423_set_modulation(fe))
 290                 goto exit;
 291
 292         fe->ops.release_sec             = isl6423_release;
 293         fe->ops.set_voltage             = isl6423_set_voltage;
 294         fe->ops.enable_high_lnb_voltage = isl6423_voltage_boost;
 295         isl6423->verbose                = verbose;
 296
 297         return fe;
 298
 299 exit:
 300         kfree(isl6423);
 301         fe->sec_priv = NULL;
 302         return NULL;
 303 }
 304 EXPORT_SYMBOL(isl6423_attach);
 305
 306 MODULE_DESCRIPTION("ISL6423 SEC");
 307 MODULE_AUTHOR("Manu Abraham");
 308 MODULE_LICENSE("GPL");